class Fastpay {

     protected $conf = [

         'appkey'=>'',//appkey

         'key'=>'',//秘钥

     ];

     protected $http_type='http';

     public function __construct($payInfo=[]){

         if($payInfo)

         {

            foreach ($payInfo as $field => $val) {

                 $this->config[$field]=$val['val'];

             }

         }

     }

     public function index($data)

     {

         $data = array(

             'appkey'=>$this->config['appkey'],//你的appkey

             'uid'=>$data['attach'],//你的用户id

             'total_fee'=>$data['total'],//你的金额

             'order_no'=>$data['pay_sn'],//你的订单号

             'pay_title'=>$data['subject'],//你的订单号

             'me_param'=>$data['attach'],//其他参数,可返回回调里面

             'notify_url'=>$data['notify_url'],//异步回调地址

             'me_back_url'=>$data['return_url'],//支付成功后返回

             'me_eshop_openid'=>'',//付款用户openid

             'me_party'=>'',//根据其他支付插件,异步回调返回同样参数,比如填写codepay,码支付,我们异步回调的时候就按码支付的回调参数返回

             'sign'=>''//签名

         );

         $checkRes=$this->checkData($data);

         if($checkRes['code']==0)

         {

             return $checkRes;

         }

         $data=$checkRes['data'];

         $url_quer=http_build_query($data);

         $url=($this->http_type=='https') ? "/fastpay/fpay/pays.php?{$url_quer}" : "/fastpay/fpay/pay.php?{$url_quer}" ;

         return ['code'=>1,'msg'=>'success','data'=>['payurl'=>$url]];

     }

     // 检测数据

     public function checkData($data)

     {

         extract($data);

         if (empty($appkey)) {

             return ['code'=>0,'msg'=>'appkey没有填写'];

         }

         if (empty($total_fee)) {

             return ['code'=>0,'msg'=>'金额不能为空'];

         }

         if (empty($uid)) {

             return ['code'=>0,'msg'=>'付款用户id不能为空'];

         }

         if (empty($order_no)) {

             return ['code'=>0,'msg'=>'请输入支付编号'];

         }

         if (!empty($me_back_url)) {

             $data['me_back_url']=urlencode($me_back_url);

         }

         if (!empty($notify_url)) {

             $data['notify_url']=urlencode($notify_url);

         }

         // 直接将金额精确到两位数

         $data['total_fee']=bcadd($total_fee, 0, 2);

         if (empty($sign)) {

             $data['sign']=$this->pay_sign($data);

         }

         return ['code'=>1,'msg'=>'success','data'=>$data];

     }

     //支付下单计算签名

     public function pay_sign($paydata)

     {

         $str_sign="appkey={$paydata['appkey']}&order_no={$paydata['order_no']}&secretkey=".$this->config['key']."&total_fee={$paydata['total_fee']}&uid={$paydata['uid']}&";

         $sign=md5($str_sign);

         return $sign;

     }

     function notify_sign($paydata)

     {

         $str_sign="appkey={$paydata['appkey']}&order_no={$paydata['order_no']}&secretkey=".SECRET_KEY."&me_pri={$paydata['me_pri']}&uid={$paydata['uid']}&";

         $sign=md5($str_sign);

         return $sign;

     }

 }